65382991 has 4 divisors (see below), whose sum is σ = 65656800. Its totient is φ = 65109184.

The previous prime is 65382979. The next prime is 65383027. The reversal of 65382991 is 19928356.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65382991 - 2⁹ = 65382479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65182991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136546 + ... + 137023.

It is an arithmetic number, because the mean of its divisors is an integer number (16414200).

Almost surely, 2^65382991 is an apocalyptic number.

65382991 is a deficient number, since it is larger than the sum of its proper divisors (273809).

65382991 is a wasteful number, since it uses less digits than its factorization.

65382991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273808.

The product of its digits is 116640, while the sum is 43.

The square root of 65382991 is about 8085.9749566765. The cubic root of 65382991 is about 402.8607231341.

The spelling of 65382991 in words is "sixty-five million, three hundred eighty-two thousand, nine hundred ninety-one".